Invoke-Command with -credentials

I want to invoke a command on a remote server, I do not want to have to put in the password to run the script. I've tried encrypting the password and storing it in a txt file.

 $username = "Mydomain\service.account" $password = cat C:\username-password-encrypted.txt | convertto-securestring $cred = new-object -typename System.Management.Automation.PSCredential - argumentlist $username, $password Invoke-command $cred -Computer myserver -scriptblock {param([string]$LocalUser); Add-PSSnapin Citrix* ; Get-BrokerSession -max 10000 | Where-Object brokeringusername -eq  "mydomain\$($LocalUser)" | Stop-BrokerSession} -ArgumentList $user

Here is the error I get

 Invoke-Command : A positional parameter cannot be found that accepts argument 'System.Management.Automation.PSCredential'. At \\uncpath\citrix\Installation Media\Citrix\Ticketing_script\Ticketing_Script - Copy (3).ps1:70 char:1+ Invoke-command $cred -Computer MyServer -scriptblock {param([s ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : InvalidArgument: (:) [Invoke-Command],   ParameterBindingException+ FullyQualifiedErrorId :   PositionalParameterNotFound,Microsoft.PowerShell.Commands.InvokeCommandCommand

There has to be an easier way to run this command on myserver without having to put in the password every time.